171.leetcode Excel Sheet Column Number(easy)[进制转换]

Related to question Excel Sheet Column Title

Given a column title as appear in an Excel sheet, return its corresponding column number.

For example:

    A -> 1    B -> 2    C -> 3    ...    Z -> 26    AA -> 27    AB -> 28

 题目的含义是将A这样表示的转换成十进制，其实就是每逢26进制转换一次

class Solution {public:    int titleToNumber(string s) {        int result = 0;        for(int i=0;i<s.length();i++)        {            result += (s[i]-'A'+1)*pow(26,s.length()-1-i);        }        return result;    }};